[Bug target/108742] Incorrect constant folding with (or exposed by) -fexcess-precision=standard

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108742

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
https://eel.is/c++draft/cfloat.syn points to the C standard for FLT_EVAL_METHOD
(plus https://eel.is/c++draft/expr#pre-6 talks about excess precision too) and
e.g. C17
5.2.4.2.2/9):
"2 evaluate all operations and constants to the range and precision of the long
double type."

Note the " and constants" above.